Lower Thread Winding Holder Groove Design
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Solution Overview
Problem
Existing lower thread winding devices face challenges in performing thread cutting processes effectively for bobbins with different outer diameters, leading to inconsistent thread lengths and potential issues during sewing operations.
Innovation Solution
A lower thread winding device with a holder featuring intersecting inner and outer groove portions and a single blade member for thread cutting, allowing for adjustable blade positions to accommodate both small and large diameter bobbins, ensuring consistent thread cutting across varying bobbin sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the threading groove position is set corresponding to the bobbin having a smaller diameter, then the thread cutting process is effective for small-diameter bobbins, but the lower thread length becomes extremely long for large-diameter bobbins
Solution Approach 1:
The threading groove is divided into two separate grooves: a first threading groove for small-diameter bobbins and a second threading groove for large-diameter bobbins. This segmentation allows each groove to be optimized for its specific bobbin size, ensuring proper thread cutting precision while maintaining appropriate thread lengths for each case.
Solution Approach 2:
The holder is designed to be rotatable relative to the bobbin, allowing the threading groove to dynamically adjust its position. This enables the system to switch between different threading groove configurations depending on the bobbin diameter being used, optimizing both thread cutting precision and thread length control.
2Length of moving object
If the threading groove position is set corresponding to the bobbin having a larger diameter, then the lower thread length is controlled for large-diameter bobbins, but one end of the lower thread cannot be held for small-diameter bobbins
Solution Approach 1:
The threading groove is divided into two separate grooves: a first threading groove for small-diameter bobbins and a second threading groove for large-diameter bobbins. This segmentation allows each groove to be optimized for its specific bobbin size, ensuring proper thread cutting precision while maintaining appropriate thread lengths for each case.
Solution Approach 2:
Two different threading groove configurations are provided on the same holder, essentially creating copies of the threading function optimized for different bobbin sizes. This allows the system to select the appropriate groove configuration for each bobbin type, ensuring reliable thread holding and consistent thread lengths.
3Device complexity
If a single threading groove position is used for both small and large diameter bobbins, then the device structure is simplified, but the thread cutting process cannot be performed effectively for both bobbin sizes
Solution Approach 1:
Two different threading groove configurations are merged onto a single holder that can rotate. This combining approach maintains relatively simple device structure while enabling effective thread cutting for both small and large diameter bobbins through the rotatable mechanism that selects the appropriate groove.
Solution Approach 2:
The holder is designed with multi-functionality, serving both as a support structure and as a selectable mechanism for different threading groove configurations. This universal design allows a single component to handle multiple bobbin sizes effectively without requiring completely separate devices.
Data Source
AI summary
In thread cutting mechanism portions of a lower thread winding device, two groove portions of an inner threading groove portion and an outer threading groove portion are formed on a holder. In the inner threading groove portion, one end portion is opened to one of an intersecting direction intersecting with a radial direction of the holder at an outer peripheral portion of the holder and another end portion is located at an inner side of a small-diameter bobbin in the radial direction. The outer threading groove portion is located at an outer side of the inner threading groove portion in the radial direction of the holder. In the outer threading groove portion, one end portion is communicated with the inner threading groove portion and located at the outer side of a large-diameter bobbin in the radial direction and another end portion is located at the inner side of the large-diameter bobbin in the radial direction.